Flora of North America species comparison

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Ephemerum crassinervium

earth moss, ephemerum moss
Habit Plants up to 2.5 mm, scattered in sparse protonemata.
Leaves

lanceolate, broadly linear or ligulate, acuminate, sometimes narrowed distally from shoulders, 0.8–2.5 × 0.15–0.4 mm;

margins serrulate or serrate, with teeth sometimes recurved up to 45°;

apex acuminate and papillose;

costa at the base thin or not always apparent, stronger distally, often filling the acumen, percurrent or excurrent, papillose;

areolation firm proximally and distally compact to dense;

median laminal cells in ± vertical rows, smooth or slightly papillose;

distal laminal cells papillose.
Capsule

with columella resorbed before meiosis;

stomates in proximal half or scattered throughout.
Spores

various, 43–120 × 35–80 µm.

Ephemerum crassinervium
Distribution
from USDA
North America; Europe; e Asia; Pacific Islands (New Zealand)
[WildflowerSearch map]
Discussion

Varieties 2 (2 in the flora).

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Key
1. Distal leaves lanceolate to broadly linear and acuminate, with compact to rather dense areolation in the distal two-thirds
var. crassinervium
1. Distal leaves broadly lanceolate to oblong-lanceolate or ligulate and subulate, often narrowed from a slight to prominent shoulder, densely papillose in the distal half
var. texanum
Source FNA vol. 27, p. 651.
Parent taxa Ephemeraceae > Ephemerum
Sibling taxa
E. cohaerens, E. serratum, E. spinulosum
Subordinate taxa
E. crassinervium var. crassinervium, E. crassinervium var. texanum
Synonyms Phascum crassinervium
Name authority (Schwägrichen) Hampe: Flora 20: 285. (1837)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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